This is a cool photograph because when you first see it you are unsure if you are looking at an adult domestic cat killing or eating a newborn kitten (!) or a mother cat grabbing her newborn by the scruff of the neck to carry her to the den. The thing is that mothers do rarely kill their young. I have a page on this in which I discuss the reasons which you can read by clicking here.
It is hard to capture this kind of photograph as the moments are very fleeting. You just have to have the camera at the ready and be all the cat for a while to get that moment. I guess this could disturb the cat as some don’t like being photographed and in any case you want to leave a mother and her young kittens alone as she has a lot of work to do and demands peace and quiet.
HERE ARE SOME MORE PAGES ON MOTHERING: